Leo Apotheker has big plans. HP (relatively) new CEO wants to transform the company, and is willing to break with almost everything his predecessor Mark Hurd set out. How about webOS on every computer shipped by HP?

Recompiling applications to be compatible to specific hardware arch is not a simple thing, and even then, it is almost equivalent to re-writing the application from scratch. The only advantage is that you already have the application logic. You have to consider your target's environment, existing dev libraries, IDEs and support that depends on your application requirements.
That is why, Win8 for Arm will still years to become an accepted platform for developers, methinks.